 Friday, January 06, 2012, 15:37, Isaac Earle, Maintenance, Target 2, Target, Transferred M20 beam blocker to hot cell
|
Uncovered T2 monolith and transferred M20BB to hot cell using flask.
Field at 0.5m from beam blocker while being lifted with flask: 21,700 |
|
Thursday, January 12, 2012, 11:34, Isaac Earle, Maintenance, Target 2, Target, Replaced M20 Beam Blocker Vacuum Seal O-Rings
|
Replaced M20 beam blocker vacuum seal o-rings. Old o-rings were noticeably harder, but not brittle or cracked. Applied "Haskel
Dry Air Seal" lubricant to air cylinder shafts and "Apiezon M Grease" to vacuum seal o-rings and main shaft. Took approximately 1
full days work. Total dose: 0.08mSv. |
Friday, January 13, 2012, 17:04, Isaac Earle, Repair, Target 2, Target, Broken Part found on M20 Beam Blocker 
|
While wrapping up vacuum seal bearing replacement on the M20 beam blocker I found a piece of hard black material approximately 3x1x1cm on top of
the hot cell turntable. Checked for contamination and found 480,000cpm on the Ludlum 44-2 probe, and off scale on the pancake monitor. This
piece fell from the transport flask when it was opened above the hot cell after picking up the M20 beam blocker. Upon further inspection, more pieces |
|
Wednesday, January 18, 2012, 12:01, Isaac Earle, Repair, Target 2, Target, Broken M20BB Bearing Removed, New Design Complete
|
The broken M20 beam blocker plastic shaft bearing was removed. Measurements of the bearing as well as the shielding disc (for which drawings
can't be found) were taken inside the hot cell and a brass replacement bearing has been designed based on these measurements.
Photos of the removed bearing, measured dimensions of bearing and shielding disc, and a PDF drawing of the new design are attached. |
|
Friday, January 20, 2012, 10:23, Isaac Earle, Repair, Target 2, Target, M20 BB Shaft Bearing Replaced
|
The replacement shaft bearing was machined by Maico Dalla Valle and installed in the beam blocker. Smooth operation of the beam blocker air cylinders
was confirmed, and the beam blocker is scheduled to be re-installed in the T2 monolith on Monday morning (Jan 23). |
|
Monday, January 23, 2012, 15:27, Isaac Earle, Repair, Target 2, Target, M20BB returned to beam line. M9BB moved to hot cell.
|
M20 beam blocker was transferred from the hot cell to the beam line.
M9 beam blocker was transferred from the beam line to the hot cell.
Field at 50cm from M9 beam blocker during removal: 5000μSv/hr |
|
Wednesday, January 25, 2012, 13:26, Isaac Earle, Maintenance, Target 2, Target, M9BB Returned to Beam Line
|
M9 beam blocker returned to beam line.
T2 target disconnected, picked up using flask, and returned to beam line as training exercise.
Field @ 50cm from T2 target during removal: ~90,000μSv/hr |
|
Tuesday, February 21, 2012, 09:56, Isaac Earle, Repair, Target 2, Target, Air Supply Check Valve & Q4 Flow Transducer
|
The faulty air pressure supply check valve for M9BB, M20BB, and T2 Profile Monitor was replaced.
The rotor, shaft, and o-ring were replaced on the Q4 flow transducer to address erroneous readout that began last week.
The attached plot shows the flow readout before failure, during the failed state, and after repair. |
|
Tuesday, March 06, 2012, 15:27, Isaac Earle, Repair, Target 1, Target, Quick Connect Fittings on T1 Target
|
The air hoses for the profile monitor supply line were inspected and no cracking was found (was found on T2). The quick connect fittings
for the bottom air assembly were sticky/corroded and not actuating properly. Replaced fittings with new parts. |
|
Friday, March 23, 2012, 14:50, Isaac Earle, Repair, Target 1, Target, T1 Target Leak - Update
|
The T1-MK2 target was transferred from the beam line to the hot cell. Water was seen in the bottom of the target pipe confirming that the leak
is from the target. The lower cone of the target assembly was submerged in the water and came up dripping wet. The profile monitor, protect
monitor, and two of the target cassettes were also wet. As it is not possible for those to be submerged, water was likely spraying from either the |
|
Tuesday, March 27, 2012, 13:14, Isaac Earle, Repair, Target 1, Target, Water removal from T1 monolith
|
All water was removed from the base of the target hole in the T1 monolith using a suction tube device and wypalls. Video inspection was performed
and revealed standing water in the unused 4" beam line pipe facing south as well as on the bellows on the M13 beam line. (Photos attached)
Vacuum group is currently pumping down on the T1 volume to remove the remainder of the water. |
|
Monday, April 02, 2012, 15:18, Isaac Earle, Repair, Target 1, Target, T1-MK1 Installed in Beam Line
|
The T1-MK1 target was transferred from the storage pit to the beam line. Services were hooked up and the cooling package was started (operating
normally).
Target ladder documentation and elevation values for the new target were delivered to operations. |
|
Tuesday, April 03, 2012, 15:55, Isaac Earle, Maintenance, Target 1, Target, T1 Ladder Position Look-up Tables Updated
|
| Graham Waters has activated the appropriate target ladder position look-up tables for the T1-MK1 target which was installed in the beam line yesterday. |
|
Wednesday, April 04, 2012, 15:51, Isaac Earle, Repair, Target 2, Target, BL1A Update
|
Vacuum interlock defeat jumpers were removed for T1 and T2. The interlock was tested by venting the T1 and T2 volumes. Both packages registered
a vacuum trip, however only the T1 package shut off. A fault report has been filed to investigate this.
|
|
Thursday, April 05, 2012, 12:14, Isaac Earle, Repair, Target 1, Target, T1 & T2 Profile Monitors
|
Controls Group replaced the wiring and wire harness for the profile monitor limit switches on T2. The monitor was actuated remotely and functioned
properly.
The T1 profile monitor was also tested and actuated properly. The T1 monolith is now ready to be covered so that blocks may be removed from |
|
Thursday, April 05, 2012, 15:22, Isaac Earle, Maintenance, Target 1, Target, T1 & T2 Profile and Protect "Blip" Test
|
Diagnostics group completed their "blip" signal response tests on the T1 and T2 profile and protect monitors. A small amount of
leakage was observed on the T2 profile monitor, but was not thought to be a significant concern. All other results were normal. |
|
Wednesday, April 11, 2012, 17:02, Isaac Earle, Repair, Target 2, Target, T2 Vacuum Interlock & Expansion Tank Level Sensor
|
The problem with the T2 vacuum interlock was fixed by restarting the "Crate TG1" control panel microprocessor. The T1 and T2 vacuum
interlocks were retested several times and are functioning properly. Fault report #5907 was returned.
|
|
Thursday, April 12, 2012, 15:19, Isaac Earle, Maintenance, Target 2, Target, T2 Target Water Drained
|
In preparation for extended periods of the T2 volume being vented during the M20 repair, the T2 water package was shut-off, the water lines were
disconnected from the target, and the cooling water was removed from the target using compressed air. |
|
Monday, April 23, 2012, 09:55, Isaac Earle, Repair, Target 1, Target, Hot Cell Manipulator Broken Cable
|
While working on the leak repair of the T1-MK2 target in the hot cell on Friday April 20th, a cable snapped on the slave end of the right side
manipulator. It is suspected to be the 'Y' shaped cable assembly that actuates the grippers when the lever is pulled on the master end.
The target repair job cannot continue until the manipulator is repaired. The repair job may take up to a full week, and will require space |
|
Wednesday, May 30, 2012, 15:39, Isaac Earle, Repair, Target 1, Target, West Side Manipulator Removed from Hot Cell
|
The west side manipulator was removed from the hot cell using the new manipulator removal frame. The operation went smoothly and required
about one hour with two operators after everything had been prepared. No contamination was found on the manipulator thru-tube or slave arm. Only
50cpm were measured on the wrist assembly of the slave end. |
|